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A 50-cm thick wall consists of 20 cm of aluminum, followed by 10 cm of silver, followed by 5 cm of copper followed by 15 cm of iron. If the area of the wall is 5 m by 4 m wall, compute the rate of heat flow through this wall if its left end is at 0^oC and its right end is at 100^oC.

(a) 637.8 kW

(b) 647.8 kW

(d) 667.8 kW

(e) 677.8 kW

(f) None of the above.

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